Pressure relief butterfly valve

Abstract

The present application relates to butterfly valve technical field, specifically to a kind of pressure relief butterfly valve.The pressure relief butterfly valve, including: valve body, valve body has medium passage;Butterfly plate, butterfly plate rotatably arranged in medium passage, butterfly plate is equipped with pressure relief through-hole;Rotating block, rotating block is sleeved on valve stem, rotating block is tightly matched with valve stem, rotating block is located butterfly plate side, rotating block is equipped with sealing cover, in sealing state, sealing cover is tightly matched with pressure relief through-hole, in pressure relief state, sealing cover is separated from pressure relief through-hole, valve stem is used to drive rotating block movement, to make rotating block switch from sealing state to pressure relief state;Reset elastic force component, reset elastic force component is used to provide the elastic driving force of rotating block from pressure relief state switch to sealing state.In pressure relief state, sealing cover is separated from pressure relief through-hole, medium can pass through pressure relief through-hole and flow, to reduce the torque required when valve is opened, avoid valve vibration and wear problem, improve the reliability and safety of valve.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve technology, and specifically to a pressure relief butterfly valve. Background Technology

[0002] In traditional triple-eccentric butterfly valve designs, the introduction of a second eccentric structure results in a significant eccentric torque during media flow. This design causes the sealing ring assembly to exhibit a conical, tight-fitting seal under media pressure. As the valve closes, the sealing ring assembly tightens due to the media's force, creating a self-locking effect. While this effect does enhance sealing performance, it also introduces a significant problem: to overcome the forces generated by the media, the torque required for valve opening becomes considerably large. The valve stem's rigidity may be insufficient to resist these torques. Furthermore, the valve is prone to vibration at the moment of opening due to the media's force, further exacerbating wear and impacting its reliability and safety. Summary of the Invention

[0003] In view of this, the present invention provides a pressure relief butterfly valve to solve the problem that the torque required for valve opening becomes quite large, the stiffness of the valve stem itself may not be sufficient to resist these torques, and in addition, the valve is prone to vibration due to the force of the medium at the moment of opening, which further aggravates the wear of the valve and further affects its reliability and safety.

[0004] This invention provides a pressure relief butterfly valve, comprising:

[0005] Valve body, the valve body having a medium passage;

[0006] A butterfly plate, which is rotatably disposed within the medium channel, and the butterfly plate is provided with a pressure relief through hole;

[0007] A rotating block is sleeved on the valve stem and tightly fitted with the valve stem. The rotating block is located on one side of the butterfly plate and is provided with a sealing cover. In the sealed state, the sealing cover is tightly fitted with the pressure relief through hole. In the pressure relief state, the sealing cover is separated from the pressure relief through hole. The valve stem is used to drive the rotating block to move so that the rotating block switches from the sealed state to the pressure relief state.

[0008] A reset spring assembly is provided to provide an elastic driving force for the rotating block to switch from a depressurized state to a sealed state.

[0009] Beneficial effects:

[0010] By setting a pressure relief through-hole and installing a sealing cover on the rotating block, the sealing cover and the pressure relief through-hole are tightly fitted in the sealed state to achieve normal cutoff of the medium. In the pressure relief state, the sealing cover and the pressure relief through-hole are separated, and the medium can flow through the pressure relief through-hole, thereby reducing the torque required for the valve to open and avoiding valve vibration and wear caused by the force of the medium, thus improving the reliability and safety of the valve. Secondly, the design of the reset spring component allows the rotating block to automatically reset when switching from the pressure relief state to the sealed state without additional operation, simplifying the operation process and improving work efficiency.

[0011] In one optional embodiment, the pressure relief through hole has a sealing seat, the sealing seat has a first through hole, the sealing seat and the inner wall of the pressure relief through hole have a sealing structure, the pressure relief through hole has a first elastic member, the first elastic member provides the sealing seat with an elastic driving force to move toward the sealing cover, under the elastic driving force, the first elastic member makes the sealing seat and the sealing cover fit tightly to seal the first through hole.

[0012] Beneficial effects:

[0013] The first elastic element provides a continuous elastic driving force to the sealing seat, ensuring a tight fit between the sealing seat and the sealing cover, effectively preventing media leakage and improving the valve's sealing performance. Furthermore, the sealing structure between the sealing seat and the inner wall of the pressure relief orifice further enhances the valve's sealing effect, allowing the media to flow only through the first orifice between the cavities, thus avoiding media leakage. This design is compact, easy to operate, and facilitates maintenance and replacement of the seals, reducing operating costs.

[0014] In one optional embodiment, the pressure relief through hole is provided with a sealing cavity, a sliding cavity, and a fixed cavity. The sealing cavity is located at one end of the pressure relief through hole near the sealing cover, the fixed cavity is located at one end of the pressure relief through hole away from the sealing cover, and the sliding cavity is located between the sealing cavity and the fixed cavity. The sealing cavity, the sliding cavity, and the fixed cavity are interconnected. The sealing seat is slidably disposed in the sliding cavity, and a fixing block is fixedly disposed in the fixed cavity. The fixing block has a second through hole communicating with the first through hole. The first elastic element is disposed between the fixing block and the sealing seat. In the sealed state, the sealing cover is located in the sealing cavity and tightly cooperates with the sealing seat.

[0015] Beneficial effects:

[0016] By separating the sealing cavity, sliding cavity, and fixed cavity, the sealing seat can slide stably in the sliding cavity, while ensuring a tight fit between the sealing seat and the sealing cover in the sealed state. The fixed block not only provides stable support for the first elastic element, but also ensures smooth flow of the medium in the depressurized state through the connection between the second through hole and the first through hole.

[0017] In one optional embodiment, an annular protrusion is provided between the sealing cavity and the sliding cavity. The sealing seat includes a first sealing portion and a second sealing portion. The outer diameter of the first sealing portion is smaller than that of the second sealing portion. The first sealing portion extends into the sealing cavity through the annular protrusion, and the annular protrusion is used to limit the second sealing portion.

[0018] Beneficial effects:

[0019] The annular protrusion ensures the stable position of the sealing seat within the pressure relief hole. Meanwhile, the first sealing part extends into the sealing cavity through the annular protrusion, increasing the contact area with the sealing cover and improving the reliability and stability of the seal.

[0020] In one optional embodiment, the sealing structure includes a graphite ring and an O-ring, the graphite ring and the O-ring being spaced apart, the graphite ring being disposed on the side of the O-ring close to the sealing cap.

[0021] Beneficial effects:

[0022] Graphite rings have excellent wear resistance, effectively resisting the erosion and wear of the medium and extending the service life of the sealing structure. O-rings have good elasticity and sealing performance, ensuring a tight fit between the sealing seat and the inner wall of the pressure relief hole, effectively preventing medium leakage. The combined use of graphite rings and O-rings not only improves the sealing performance of the valve, but also enhances its durability and reliability.

[0023] In one optional embodiment, the outer wall of the sealing seat is provided with a first annular groove and a second annular groove, and the graphite ring and the O-ring are respectively disposed in the first annular groove and the second annular groove.

[0024] Beneficial effects:

[0025] The graphite ring and O-ring are embedded in the first and second annular grooves respectively, and fit tightly against the outer wall of the sealing seat, effectively preventing the medium from leaking through the gap between the sealing seat and the inner wall of the pressure relief hole, and further improving the sealing effect of the valve.

[0026] In one optional embodiment, the sealing cover is disposed on one side of the rotating block, and the reset elastic assembly is disposed on the other side of the rotating block. The reset elastic assembly includes a second elastic member, the two ends of which are respectively connected to the rotating block and the butterfly plate.

[0027] Beneficial effects:

[0028] By setting a second elastic element, with its two ends connected to the rotating block and the butterfly plate respectively, it is ensured that the rotating block can automatically reset when switching from the pressure relief state to the sealing state without additional operation, further simplifying the operation process and improving work efficiency. The design of the second elastic element enables the rotating block to automatically return to its initial position after being rotated by external force, ensuring the stability and reliability of the valve.

[0029] In one optional embodiment, the butterfly plate is provided with a guide groove, one end of the second elastic member is connected to the bottom of the guide groove, the reset elastic assembly further includes a guide member, the guide member is fixedly disposed on the rotating block, and the other end of the second elastic member is sleeved on the guide member.

[0030] Beneficial effects:

[0031] The guide component is fixedly mounted on the rotating block, and the other end of the second elastic component is sleeved on the guide component. The design of the guide component further enhances the stability and guiding properties of the second elastic component, allowing it to move more smoothly during expansion and contraction and reducing its susceptibility to interference from external factors. Through the coordinated use of the guide groove and the guide component, the rotating block automatically resets when switching from a pressure-relief state to a sealing state. This reset process is stable and reliable, further improving the valve's working efficiency and reliability.

[0032] In one optional embodiment, the rotating block has a connecting through hole, the inner wall of the connecting through hole has a first fixing groove, the valve stem has a second fixing groove that matches the first fixing groove, the rotating block is sleeved on the valve stem through the connecting through hole, and a fixing key is inserted into the first fixing groove and the second fixing groove to fix the rotating block to the valve stem.

[0033] Beneficial effects:

[0034] By setting the first fixing groove, the second fixing groove, and the fixing key, the installation and disassembly of the rotating block and the valve stem are facilitated, thus improving work efficiency.

[0035] In one alternative embodiment, the side of the rotating block facing the butterfly plate is arc-shaped, and the side of the butterfly plate facing the rotating block is constructed as an arc-shaped surface, with a clearance between the arc-shaped surface and the butterfly plate.

[0036] Beneficial effects:

[0037] The clearance between the curved surface and the rotating block prevents interference or jamming during the rotating block's rotation, ensuring smoother rotation. Furthermore, the curved design reduces the scouring effect of the medium on the rotating block and butterfly plate, extending the valve's service life. During rotation, the combination of the curved surface and the clearance allows the rotating block to smoothly drive the butterfly plate, thus enabling the opening or closing of the medium passage. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a horizontal cross-sectional view of a pressure relief butterfly valve according to an embodiment of the present invention;

[0040] Figure 2 for Figure 1 Enlarged view of section A;

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Valve body; 2. Medium passage; 3. Butterfly plate; 4. Pressure relief through hole; 401. Sealing cavity; 402. Sliding cavity; 403. Fixed cavity; 5. Rotating block; 6. Valve stem; 7. Sealing cover; 8. Reset spring assembly; 801. Second spring element; 802. Guide element; 9. Sealing seat; 901. First sealing part; 902. Second sealing part; 10. First through hole; 11. Sealing structure; 1101. Graphite ring; 1102. O-ring; 12. First spring element; 13. Fixed block; 14. Second through hole; 15. Annular protrusion; 16. First annular groove; 17. Second annular groove; 18. Guide groove; 19. Connecting through hole; 20. First fixed groove; 21. Second fixed groove; 22. Fixed key; 23. Arc-shaped surface. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] The following is combined with Figure 1 and Figure 2 The following describes embodiments of the present invention.

[0045] According to an embodiment of the present invention, a pressure relief butterfly valve is provided, comprising: a valve body 1, a butterfly plate 3, a rotating block 5, and a reset spring assembly 8.

[0046] Specifically, the valve body 1 has a medium passage 2. A butterfly plate 3 is rotatably disposed within the medium passage 2, and the butterfly plate 3 is provided with a pressure relief through hole 4. A rotating block 5 is sleeved on the valve stem 6, and the rotating block 5 is tightly fitted with the valve stem 6. The rotating block 5 is located on one side of the butterfly plate 3, and a sealing cover 7 is provided on the rotating block 5. In the sealed state, the sealing cover 7 is tightly fitted with the pressure relief through hole 4. In the pressure relief state, the sealing cover 7 is separated from the pressure relief through hole 4. The valve stem 6 is used to drive the rotating block 5 to move, so that the rotating block 5 switches from the sealed state to the pressure relief state. A reset spring assembly 8 is used to provide the elastic driving force for the rotating block 5 to switch from the pressure relief state to the sealed state.

[0047] In this embodiment, the butterfly plate 3 is rotatably disposed within the medium channel 2 to open or close the medium channel 2, thereby controlling the flow or interruption of the medium. A rotating block 5 is disposed on one side of the butterfly plate 3 and is fixedly mounted on the valve stem 6. When the valve stem 6 rotates, it drives the rotating block 5 to rotate. During rotation, one end of the rotating block 5 abuts against the butterfly plate 3, providing a thrust to the butterfly plate 3 to make it rotate. The butterfly plate 3 can divide the medium channel 2 into two chambers, one connected to the inlet of the valve body 1 and the other connected to the outlet of the valve body 1. A pressure relief hole 4 is provided on the butterfly plate 3, connecting the two chambers. The medium can enter the other chamber through the pressure relief hole 4, thereby completing pressure relief and reducing the torque required for valve opening. The rotating block 5 has a sealing cover 7 on one side of the butterfly plate 3. In the sealed state, the sealing cover 7 abuts against one end of the pressure relief hole 4 to close the pressure relief hole 4. During the transition from the sealed state to the pressure relief state, the valve stem 6 is rotated in the first direction, and the other side of the rotating block 5 rotates towards the butterfly plate 3, abutting against the butterfly plate 3 to drive the butterfly plate 3 to rotate. The sealing cover 7 rotates with the rotating block 5, thereby disengaging from the pressure relief hole 4, allowing the medium to enter another cavity through the pressure relief hole 4. When the sealing cover 7 disengages from the pressure relief hole 4, the pressure relief state is entered. When the rotational force driving the rotating block 5 disappears, the reset spring assembly 8 provides an elastic driving force to the rotating block 5, causing the rotating block 5 to reset, and the sealing cover 7 re-abuts against one end of the pressure relief hole 4. When it is necessary to cut off the medium flow, the valve stem 6 is rotated in the second direction, and the side of the rotating block 5 with the sealing cover 7 abuts against the butterfly plate 3, driving the butterfly plate 3 to rotate and close the medium passage 2. The rotation directions of the first and second directions are opposite.

[0048] It should be noted that by setting a pressure relief hole 4 and a sealing cover 7 on the rotating block 5, the sealing cover 7 and the pressure relief hole 4 are tightly fitted in the sealed state to achieve normal cutoff of the medium; in the pressure relief state, the sealing cover 7 is separated from the pressure relief hole 4, and the medium can flow through the pressure relief hole 4, thereby reducing the torque required for the valve to open, avoiding valve vibration and wear caused by the force of the medium, and improving the reliability and safety of the valve. Secondly, the design of the reset spring component 8 enables the rotating block 5 to automatically reset when switching from the pressure relief state to the sealed state without additional operation, simplifying the operation process and improving work efficiency.

[0049] In one embodiment, the pressure relief through hole 4 has a sealing seat 9, the sealing seat 9 has a first through hole 10, the sealing seat 9 and the inner wall of the pressure relief through hole 4 have a sealing structure 11, the pressure relief through hole 4 has a first elastic member 12, the first elastic member 12 provides the sealing seat 9 with an elastic driving force to move toward the sealing cover 7, under the elastic driving force, the first elastic member 12 makes the sealing seat 9 and the sealing cover 7 tightly fit together to seal the first through hole 10.

[0050] Specifically, such as Figure 2 As shown, the two cavities are connected through the first through hole 10. The sealing seat 9 is movably disposed in the pressure relief through hole 4. There is a sealing structure 11 between the sealing seat 9 and the inner wall of the pressure relief through hole 4, so that the medium can only flow into the other cavity from the first through hole 10. The pressure relief through hole 4 has a first elastic element 12, which can provide elastic driving force to the sealing seat 9. In the sealed state, the first elastic element 12 drives the sealing seat 9 to move toward the sealing cover 7. Under the action of the elastic force of the first elastic element 12, the sealing seat 9 is tightly fitted with the sealing cover 7. The first elastic element 12 and the sealing cover 7 cooperate with each other to provide elastic force and pressure to the sealing seat 9, thereby sealing the first through hole 10.

[0051] Preferably, the first elastic element 12 is a disc spring.

[0052] Furthermore, the end of the first through hole 10 facing the sealing cover 7 has a gradually widening opening. The gradually widening opening can reduce the scouring and wear of the fluid on the edge of the pipe inlet, while ensuring a more uniform velocity distribution of the fluid entering the pipe.

[0053] The first elastic element 12 provides a continuous elastic driving force to the sealing seat 9, ensuring a tight fit between the sealing seat 9 and the sealing cover 7, effectively preventing media leakage and improving the valve's sealing performance. Furthermore, the sealing structure 11 between the sealing seat 9 and the inner wall of the pressure relief hole 4 further enhances the valve's sealing effect, allowing the medium to flow only through the first through hole 10 between the cavities, thus avoiding media leakage. This design is compact, easy to operate, and easy to maintain and replace the seals, reducing operating costs.

[0054] In one embodiment, the pressure relief through hole 4 is provided with a sealing cavity 401, a sliding cavity 402, and a fixed cavity 403. The sealing cavity 401 is located at one end of the pressure relief through hole 4 near the sealing cover 7, the fixed cavity 403 is located at one end of the pressure relief through hole 4 away from the sealing cover 7, the sliding cavity 402 is located between the sealing cavity 401 and the fixed cavity 403, and the sealing cavity 401, the sliding cavity 402, and the fixed cavity 403 are interconnected. The sealing seat 9 is slidably disposed in the sliding cavity 402, and a fixing block 13 is fixedly disposed in the fixed cavity 403. The fixing block 13 has a second through hole 14 that communicates with the first through hole 10. The first elastic member 12 is disposed between the fixing block 13 and the sealing seat 9. In the sealed state, the sealing cover 7 is located in the sealing cavity 401 and is tightly fitted with the sealing seat 9.

[0055] Specifically, such as Figure 2 As shown, the sealing cavity 401 is located above the sliding cavity 402, and the fixed cavity 403 is located below the sliding cavity 402. The sealing cavity 401, the sliding cavity 402, and the fixed cavity 403 are interconnected. The sealing seat 9 can move along the guiding direction of the sliding cavity 402. There is a cavity between the sealing seat 9 and the fixed block 13. The first elastic member 12 is located in the cavity. The fixed block 13 can provide support force for the first elastic member 12. In the sealed state, the sealing cover 7 can extend into the sealing cavity 401 and fit tightly with the sealing seat 9. In the depressurized state, the medium can enter the cavity through the first through hole 10 and enter the second through hole 14 from the cavity, and then flow into another cavity along the second through hole 14.

[0056] By separately setting up a sealing cavity 401, a sliding cavity 402, and a fixed cavity 403, the sealing seat 9 can slide stably in the sliding cavity 402, while ensuring the tight fit between the sealing seat 9 and the sealing cover 7 in the sealed state. The setting of the fixed block 13 not only provides stable support for the first elastic member 12, but also ensures the smooth flow of the medium in the depressurized state through the connection between the second through hole 14 and the first through hole 10.

[0057] In one embodiment, there is an annular protrusion 15 between the sealing cavity 401 and the sliding cavity 402. The sealing seat 9 includes a first sealing part 901 and a second sealing part 902. The outer diameter of the first sealing part 901 is smaller than that of the second sealing part 902. The first sealing part 901 extends into the sealing cavity 401 through the annular protrusion 15. The annular protrusion 15 is used to limit the second sealing part 902.

[0058] Specifically, such as Figure 2 As shown, the annular protrusion 15 can limit the second sealing part 902 to prevent it from falling out of the sliding cavity 402. The first sealing part 901 can pass through the annular protrusion 15 and enter the sealing cavity 401. The first sealing part 901 can fit tightly with the sealing cover 7 in the sealing cavity 401.

[0059] The limiting effect of the annular protrusion 15 ensures the stable position of the sealing seat 9 in the pressure relief hole 4. At the same time, the first sealing part 901 extends into the sealing cavity 401 through the annular protrusion 15, increasing the contact area with the sealing cover 7 and improving the reliability and stability of the seal.

[0060] In one embodiment, the sealing structure 11 includes a graphite ring 1101 and an O-ring 1102, which are spaced apart, with the graphite ring 1101 disposed on the side of the O-ring 1102 close to the sealing cover 7.

[0061] Specifically, such as Figure 2 As shown, the graphite ring 1101 is positioned above the O-ring 1102. The graphite ring 1101 has excellent wear resistance, effectively resisting the erosion and wear of the medium, thus extending the service life of the sealing structure 11. The O-ring 1102 has good elasticity and sealing performance, ensuring a tight fit between the sealing seat 9 and the inner wall of the pressure relief hole 4, effectively preventing medium leakage. The combined use of the graphite ring 1101 and the O-ring 1102 not only improves the sealing performance of the valve but also enhances its durability and reliability.

[0062] In one embodiment, the outer wall of the sealing seat 9 is provided with a first annular groove 16 and a second annular groove 17, and the graphite ring 1101 and the O-ring 1102 are respectively disposed in the first annular groove 16 and the second annular groove 17.

[0063] Specifically, such as Figure 2 As shown, the opening of the first annular groove 16 and the second annular groove 17 provides a stable installation position for the graphite ring 1101 and the O-ring 1102, ensuring the firmness and stability of the sealing structure 11 within the pressure relief hole 4. The graphite ring 1101 and the O-ring 1102 are respectively embedded in the first annular groove 16 and the second annular groove 17, tightly fitting against the outer wall of the sealing seat 9, effectively preventing media leakage through the gap between the sealing seat 9 and the inner wall of the pressure relief hole 4, further improving the valve's sealing effect.

[0064] In one embodiment, the sealing cover 7 is disposed on one side of the rotating block 5, and the reset elastic assembly 8 is disposed on the other side of the rotating block 5. The reset elastic assembly 8 includes a second elastic member 801, and the two ends of the second elastic member 801 are respectively connected to the rotating block 5 and the butterfly plate 3.

[0065] Specifically, such as Figure 1As shown, the second elastic element 801 provides elastic driving force to the rotating block 5, so that the rotating block 5 can automatically reset when switching from the depressurization state to the sealing state. One end of the second elastic element 801 is fixedly connected to the rotating block 5, and the other end is connected to the butterfly plate 3. When the rotating block 5 is rotated by an external force, the second elastic element 801 will deform and store elastic potential energy. When the external force disappears, the second elastic element 801 releases the elastic potential energy and drives the rotating block 5 to reset.

[0066] Preferably, the second elastic element 801 is a columnar spring.

[0067] By setting a second elastic element 801, with its two ends connected to the rotating block 5 and the butterfly plate 3 respectively, it is ensured that the rotating block 5 can automatically reset when switching from the pressure relief state to the sealing state without additional operation, which further simplifies the operation process and improves work efficiency. The design of the second elastic element 801 enables the rotating block 5 to automatically return to its initial position after being rotated by external force, ensuring the stability and reliability of the valve.

[0068] In one embodiment, the butterfly plate 3 is provided with a guide groove 18, one end of the second elastic member 801 is connected to the bottom of the guide groove 18, and the reset elastic assembly 8 also includes a guide member 802, which is fixedly mounted on the rotating block 5, and the other end of the second elastic member 801 is sleeved on the guide member 802.

[0069] Specifically, such as Figure 1 As shown, the guide groove 18 provides guidance and limiting for the second elastic element 801, ensuring its stability during extension and retraction and preventing deviation or twisting. This guarantees the accuracy and reliability of the rotating block 5's reset. The guide element 802 is fixedly mounted on the rotating block 5, and the other end of the second elastic element 801 is fitted onto it. The design of the guide element 802 further enhances the stability and guidance of the second elastic element 801, allowing it to move more smoothly and less susceptible to external interference. Through the combined use of the guide groove 18 and the guide element 802, the rotating block 5 automatically resets when switching from a depressurization state to a sealing state. The reset process is stable and reliable, further improving the valve's working efficiency and reliability.

[0070] In one embodiment, the rotating block 5 has a connecting through hole 19, the inner wall of the connecting through hole 19 has a first fixing groove 20, the valve stem 6 has a second fixing groove 21 that matches the first fixing groove 20, the rotating block 5 is sleeved on the valve stem 6 through the connecting through hole 19, and the fixing key 22 is inserted into the first fixing groove 20 and the second fixing groove 21 so that the rotating block 5 is fixedly connected to the valve stem 6.

[0071] Specifically, such as Figure 1As shown, the inner wall of the connecting through hole 19 has a first fixing groove 20, and the outer wall of the valve stem 6 has a corresponding second fixing groove 21 that matches the first fixing groove 20. When the rotating block 5 is sleeved on the valve stem 6 through the connecting through hole 19, the first fixing groove 20 and the second fixing groove 21 are aligned. At this time, the fixing key 22 is inserted into the first fixing groove 20 and the second fixing groove 21 to achieve a fixed connection between the rotating block 5 and the valve stem 6, preventing the rotating block 5 from rotating on the valve stem 6. By setting the first fixing groove 20, the second fixing groove 21 and the fixing key 22, the installation and disassembly of the rotating block 5 and the valve stem 6 are facilitated, improving work efficiency.

[0072] Preferably, the fixing key 22 is made of an elastic material, which has a certain elasticity and reset capability. When it is necessary to remove the rotating block 5 from the valve stem 6, the fixing key 22 can be pulled outward to disengage the fixing key 22 from the first fixing groove 20 and the second fixing groove 21, thereby releasing the fixed connection between the rotating block 5 and the valve stem 6, which facilitates the replacement or maintenance of the rotating block 5 or the valve stem 6.

[0073] Furthermore, the rotating block 5 is fixedly connected to the valve stem 6 by fasteners (not shown). Preferably, the fasteners are screws. The rotating block 5 and the valve stem 6 are fixedly connected by the fixing key 22 and the fasteners.

[0074] In one embodiment, the side of the rotating block 5 facing the butterfly plate 3 is arc-shaped, and the side of the butterfly plate 3 facing the rotating block 5 is constructed as an arc-shaped surface 23, with a clearance between the arc-shaped surface 23 and the butterfly plate 3.

[0075] Specifically, such as Figure 1 As shown, the side of the rotating block 5 facing the butterfly plate 3 is designed in an arc shape, matching the arc-shaped surface 23 of the butterfly plate 3 facing the rotating block 5. The diameter of the arc-shaped surface 23 is larger than the diameter of the arc of the rotating block 5. The clearance between the arc-shaped surface 23 and the rotating block 5 can also prevent interference or jamming during the rotation of the rotating block 5, making the rotation of the rotating block 5 smoother. In addition, the arc-shaped design can also reduce the scouring of the rotating block 5 and the butterfly plate 3 by the medium, extending the service life of the valve. During the rotation of the rotating block 5, the cooperation of the arc-shaped surface 23 and the clearance allows the rotating block 5 to smoothly drive the butterfly plate 3 to rotate, thereby realizing the opening or closing operation of the medium channel 2.

[0076] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A pressure relief butterfly valve, characterized in that, include: Valve body (1), the valve body (1) having a medium passage (2); The butterfly plate (3) is rotatably disposed in the medium channel (2), and the butterfly plate (3) is provided with a pressure relief through hole (4). A rotating block (5) is sleeved on a valve stem (6). The rotating block (5) is in close contact with the valve stem (6). The rotating block (5) is located on one side of the butterfly plate (3). A sealing cover (7) is provided on the rotating block (5). In the sealed state, the sealing cover (7) is in close contact with the pressure relief hole (4). In the pressure relief state, the sealing cover (7) is separated from the pressure relief hole (4). The valve stem (6) is used to drive the rotating block (5) to move so that the rotating block (5) switches from the sealed state to the pressure relief state. Reset elastic assembly (8), the reset elastic assembly (8) is used to provide the elastic driving force for the rotating block (5) to switch from the depressurized state to the sealed state; The pressure relief through hole (4) has a sealing seat (9), the sealing seat (9) has a first through hole (10), the sealing seat (9) and the inner wall of the pressure relief through hole (4) have a sealing structure (11), the pressure relief through hole (4) has a first elastic member (12), the first elastic member (12) provides the sealing seat (9) with an elastic driving force to move toward the sealing cover (7), under the action of the elastic driving force, the first elastic member (12) makes the sealing seat (9) and the sealing cover (7) fit tightly to seal the first through hole (10).

2. The pressure relief butterfly valve according to claim 1, characterized in that, The pressure relief through hole (4) is provided with a sealing cavity (401), a sliding cavity (402), and a fixed cavity (403). The sealing cavity (401) is located at one end of the pressure relief through hole (4) near the sealing cover (7). The fixed cavity (403) is located at one end of the pressure relief through hole (4) away from the sealing cover (7). The sliding cavity (402) is located between the sealing cavity (401) and the fixed cavity (403). The sealing cavity (401), the sliding cavity (402), and the fixed cavity (403) are connected in a series of steps. 403) They are interconnected. The sealing seat (9) is slidably disposed in the sliding cavity (402). A fixing block (13) is fixedly disposed in the fixing cavity (403). A second through hole (14) communicating with the first through hole (10) is opened on the fixing block (13). The first elastic member (12) is disposed between the fixing block (13) and the sealing seat (9). In the sealing state, the sealing cover (7) is located in the sealing cavity (401) and tightly cooperates with the sealing seat (9).

3. The pressure relief butterfly valve according to claim 2, characterized in that, There is an annular protrusion (15) between the sealing cavity (401) and the sliding cavity (402). The sealing seat (9) includes a first sealing part (901) and a second sealing part (902). The outer diameter of the first sealing part (901) is smaller than that of the second sealing part (902). The first sealing part (901) extends into the sealing cavity (401) through the annular protrusion (15). The annular protrusion (15) is used to limit the second sealing part (902).

4. The pressure relief butterfly valve according to any one of claims 2 to 3, characterized in that, The sealing structure (11) includes a graphite ring (1101) and an O-ring (1102), the graphite ring (1101) and the O-ring (1102) are spaced apart, and the graphite ring (1101) is located on the side of the O-ring (1102) close to the sealing cover (7).

5. The pressure relief butterfly valve according to claim 4, characterized in that, The outer wall of the sealing seat (9) is provided with a first annular groove (16) and a second annular groove (17), and the graphite ring (1101) and the O-ring (1102) are respectively disposed in the first annular groove (16) and the second annular groove (17).

6. The pressure relief butterfly valve according to claim 1, characterized in that, The sealing cap (7) is disposed on one side of the rotating block (5), and the reset elastic assembly (8) is disposed on the other side of the rotating block (5). The reset elastic assembly (8) includes a second elastic member (801), and the two ends of the second elastic member (801) are respectively connected to the rotating block (5) and the butterfly plate (3).

7. The pressure relief butterfly valve according to claim 6, characterized in that, The butterfly plate (3) is provided with a guide groove (18). One end of the second elastic member (801) is connected to the bottom of the guide groove (18). The reset elastic assembly (8) also includes a guide member (802). The guide member (802) is fixedly mounted on the rotating block (5). The other end of the second elastic member (801) is sleeved on the guide member (802).

8. The pressure relief butterfly valve according to claim 1, characterized in that, The rotating block (5) has a connecting through hole (19), the inner wall of the connecting through hole (19) has a first fixing groove (20), the valve stem (6) has a second fixing groove (21) that matches the first fixing groove (20), the rotating block (5) is sleeved on the valve stem (6) through the connecting through hole (19), and the fixing key (22) is inserted in the first fixing groove (20) and the second fixing groove (21) so that the rotating block (5) is fixedly connected to the valve stem (6).

9. The pressure relief butterfly valve according to claim 1, characterized in that, The rotating block (5) is arc-shaped on the side facing the butterfly plate (3), and the side of the butterfly plate (3) facing the rotating block (5) is constructed as an arc-shaped surface (23), with a clearance between the arc-shaped surface (23) and the butterfly plate (3).

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